The Tridoku and Star Sudoku Title update for Ultimate Sudoku Collection has 8 achievements.
Completed 5 levels of Star Sudoku
Completed 25 levels of Star Sudoku
Completed 100 levels of Star Sudoku
Completed 250 levels of Star Sudoku
Completed 5 levels of Tridoku
Completed 25 levels of Tridoku
Completed 100 levels of Tridoku
Completed 250 levels of Tridoku